Silencer for drains



Aug. 6, 19.46. H. J. SMITH SILENCER FOR DRAINS Filed Spt. 20, 194-4 I uverztor g g g 9 BBQ HENRY J 5m,

v m y QQQQQ Patented Aug. 6, 1 946 I -"UN'ITED STATE s PATENT OFFICE-2,405,241 SILENCER FOR DRAINS Henry J. Smith, Detroit, Mich.

Application September 20, 1944, Serial No. 554,981

1 Claim. 1

This invention relates to a silencer for drains, and more particularlyto such a device adapted to obviate the noise customarily made in drainpipes when air is sucked thereinto, during the drainage of fluidtherethrough.

A primary object of this invention is the provision of a valve meansadapted to be associated with a drain pipe, whereby air may be admittedto a drain pipe at a point adjacent the trap therein, thus eliminatingthe possibility of the formation of a vacuum in the pipe such as tooccasion the sucking in of air from the inlet to the drain pipe from asink, or the like.

An additional object is the provision of such a device provided for aone-way check valve, which will operate only at such times as thepressure within the pipe is reduced to admit air thereto, and which willcorrespondingly preclude the emission of gases or the like from thedrain through the valve.

Other objects will in part be obvious and in part pointed outhereinafter and shown in the accompanying drawing, wherein there isdisclosed a preferred embodiment of this inventive concept.

In the drawing:

Figure l is a view of the valve of the instant invention as applied to adrain pipe.

Figure 2 is a sectional view, enlarged, taken through the center line ofthe valve mechanism.

Figure 3 is a sectional view taken substantially along the line 3-3 ofFigure 2.

Figure 4 is an elevational view of a constructional detail, and v Figure5 is a fragmentary view, in elevation, of a still further constructionaldetail.

Like reference numerals refer to like parts throughout the several viewsof the drawing.

Having reference now to the drawing, the silencer of the instantinvention, generally indicated at H3, is applied to a drain pipe I I,having a threaded aperture !2 therein adapted to accommodate thethreaded end [3 of a cylindrical section I 4 comprising a portion of thesilencer. Portion I4 is provided with a flange adapted to seat againsteither an opposed flange l6 surrounding the aperture I2, or against thesurface of the drain pipe H directly, as desired. As best shown inFigure l, the silencer I0 is preferably positioned on a horizontallyextending portion ll of the pipe at a point adjacent the trap 18thereof, and on the opposite side of the trap from the end of the pipe19 which extends to the drain from the sink, or the like.

Referring back now to cylindrical sleeve-like portion or member M, thesame is provided at an intermediate point with a plate 25 having aplurality of aperture 26 therefore adapted to preclude the passage offoreign matter into the drain pipe. At its upper extremity, sleeve [4 isprovided with a valve seat member 21 comprising a frusto-conical portion28 terminating at its lower extremity in a flange 29, the outerperiphery of which is adapted to be seated on the upper surface ofcylindrical member l4, and hav ing two spaced plates 30 and 3|, oneadjacent its apex, and the other positioned at an intermediate pointtherein, each having a bore 32 and 33, respectively, therethrough withinwhich is slidably positioned the stem 34 of a valve 35 adapted to engagewith the valve seat 21. The upper end of valve stem 34 is provided witha plate 36 secured in position thereon, as by a cotter pin 31, betweenwhich and the upper face of flange 29 is positioned a compression spring38.

A cylindrical wire screen member 40 is adapted to be positioned aroundspring 38 and the valve stem 34 and valve seat 21, its upper extremity4| being in abutting relation with the top 42 of a cover member 43cylindrical in shape and adapted to rest on the upper surface of flange29 to completely surround the valve and valve assembly. Cover 43 isadapted to be provided with a plurality of rows of apertures 44 topermit the passage of air therethrough, each being provided with adepending flange or shield 45 to preclude the ingress of large particlesof foreign matter into the device.

From the foregoing it will be seen that there is herein provided animproved drain silencer, provided with a one-way check valve, which,when the pressure within the pipe I l is reduced, will be pulleddownwardly by the reduced pressure therein against the compression ofspring 38 to permit the ingress of air to the pipe, thus reducing thevacuum therein, but which will, when the pressure in the pipe issufliciently great to expel gas therefrom, be held in closed position bythe spring 38.

From the foregoing it will also be seen that there is herein provided adevice accomplishing all the objects of this invention and others,including many advantages of great practical utility and commercialimportance.

As many embodiments may be made of this inventive concept, and as manymodifications may be made in the embodiment hereinbefore shown anddescribed, it is to be understood that all matter herein is to beinterpreted merely as illustrative and not in a limiting sense,

I claim:

In a silencer for drains, in combination, a sleeve adapted to be securedin an aperture in a drain pipe, an apertured, frusto-conical memberforming a valve seat positioned in said sleeve, a valve engageable withsaid seat, a valve stem extending upwardly through the apertures in saidmember, spring means positioned exteriorly of said frusto-conioal memberand engaging the upper extremity of said valve stem, the opposite end of10 said spring means abutting said frusto-conical member, biasing saidvalve toward closed position and adapted to yield on a decrease ofpressure in said drain pipe to permit the ingress of air thereto, ascreen surrounding said valve and said frusto-conical member, anapertured cover member surrounding said screen, and a guard plate insaid sleeve below said valve and valve seat.

HENRY J. SMITH.

